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dm log: use flush callback fn

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Call the flush callback from the log.

If flush failed, we have no alternative but to mark the whole log as dirty.
Also we set the variable flush_failed to prevent any bits ever being marked as
clean again.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka 2009-12-10 23:52:01 +00:00 committed by Alasdair G Kergon
parent 87a8f240e9
commit 076010e2e6
1 changed files with 15 additions and 2 deletions
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17
drivers/md/dm-log.c
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@ -677,13 +677,26 @@ static int core_flush(struct dm_dirty_log *log)
static int disk_flush(struct dm_dirty_log *log)
{
int r;
struct log_c *lc = (struct log_c *) log->context;
int r, i;
struct log_c *lc = log->context;
/* only write if the log has changed */
if (!lc->touched_cleaned && !lc->touched_dirtied)
return 0;
if (lc->touched_cleaned && log->flush_callback_fn &&
log->flush_callback_fn(lc->ti)) {
/*
* At this point it is impossible to determine which
* regions are clean and which are dirty (without
* re-reading the log off disk). So mark all of them
* dirty.
*/
lc->flush_failed = 1;
for (i = 0; i < lc->region_count; i++)
log_clear_bit(lc, lc->clean_bits, i);
}
r = rw_header(lc, WRITE);
if (r)
fail_log_device(lc);